CVE-2021-32793

Name: CVE-2021-32793
Creator: NVD / NIST
Published: 2021-08-04T18:15:09.557+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.8/10EPSS 0.79%

Last modified Jun 17, 2026

CVE-2021-32793 is a medium-severity vulnerability rated 4.8/10 on the CVSS scale. Pi-hole's Web interface provides a central location to manage a Pi-hole instance and review performance statistics. Prior to Pi-hole Web interface version 5.5.1, the function to add domains to blocklists or allowlists is vulnerable to a stored cross-site-scripting vulnerability. EPSS estimates a 0.79% chance of exploitation in the next 30 days.

Description

Pi-hole's Web interface provides a central location to manage a Pi-hole instance and review performance statistics. Prior to Pi-hole Web interface version 5.5.1, the function to add domains to blocklists or allowlists is vulnerable to a stored cross-site-scripting vulnerability. User input added as a wildcard domain to a blocklist or allowlist is unfiltered in the web interface. Since the payload is stored permanently as a wildcard domain, this is a persistent XSS vulnerability. A remote attacker can therefore attack administrative user accounts through client-side attacks. Pi-hole Web Interface version 5.5.1 contains a patch for this vulnerability.

Metrics

CVSS 3.1

4.8/10

CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

EPSS Probability

0.79%

51.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Pi-Hole	Pi-Hole	< 5.5.1

References

https://github.com/pi-hole/AdminLTE/releases/tag/v5.5.1Release Notes, Third Party Advisory
https://github.com/pi-hole/AdminLTE/security/advisories/GHSA-g3w6-q4fg-p8x8Exploit, Third Party Advisory
https://github.com/pi-hole/AdminLTE/releases/tag/v5.5.1Release Notes, Third Party Advisory
https://github.com/pi-hole/AdminLTE/security/advisories/GHSA-g3w6-q4fg-p8x8Exploit, Third Party Advisory

Timeline

Published: Aug 4, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-32793?

How severe is CVE-2021-32793?

CVE-2021-32793 has a CVSS score of 4.8/10 (MEDIUM severity). The EPSS model estimates a 0.79% probability of exploitation in the next 30 days.

How do I fix CVE-2021-32793?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-32793?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST